Updates ActionMailer.mail block param's type to include its param type

[joseph-carino]

Description

Upgrading our app to rails 7.1.2 caused new sorbet issues with our usage of ActionMailer.mail: as the block param's sorbet type does not include the type of the param, sorbet is incorrectly typing the param NilClass.

Looks like the type of this param is ActionMailer::Collector so I've updated the annotation type accordingly.

Type of Change

• [ ] Add RBI for a new gem
• [X] Modify RBI for an existing gem
• [ ] Other:

Changes

• Gem name: actionmailer
• Gem version: 7.1.2
• Gem source: actionmailer/lib/action_mailer/base.rb
• Gem API doc: https://api.rubyonrails.org/v7.1.2/classes/ActionMailer/Base.html#method-i-mail
• Tapioca version: 0.12.0
• Sorbet version: 0.5.11284